Tom Lane wrote:

There's a workable-looking design in the archives (pghackers probably)
for maintaining overall table counts in a separate table, with each
transaction adding one row of "delta" information just before it
commits.  I haven't seen anything else that looks remotely attractive.

It might be useful if there was a way to trap certain queries and rewrite/replace them. That way more complex queries could be transparently redirected to a summary table etc. I'm guessing that the overhead to check every query would quickly destroy any gains though.

  Richard Huxton
  Archonet Ltd

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